Probing the light hole/heavy hole switching with correlated magneto-optical spectroscopy and chemical analysis on a single quantum dot

A whole series of complementary studies have been performed on the same single nanowire containing a quantum dot: cathodoluminescence spectroscopy and imaging, micro-photoluminescence spectroscopy under magnetic field and as a function of temperature, and energy-dispersive x-ray spectrometry and ima...

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Bibliographic Details
Published in:Nanotechnology 2019-04, Vol.30 (17), p.175301-175301
Main Authors: Artioli, A, Rueda-Fonseca, P, Moratis, K, Motte, J F, Donatini, F, Hertog, M den, Robin, E, André, R, Niquet, Y-M, Bellet-Amalric, E, Cibert, J, Ferrand, D
Format: Article
Language:English
Subjects:
cathodoluminescence
Condensed Matter
EDX
Materials Science
molecular beam epitaxy
nanowires
optical spectroscopy
Physics
quantum dot
semiconductors
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Summary:A whole series of complementary studies have been performed on the same single nanowire containing a quantum dot: cathodoluminescence spectroscopy and imaging, micro-photoluminescence spectroscopy under magnetic field and as a function of temperature, and energy-dispersive x-ray spectrometry and imaging. The ZnTe nanowire was deposited on a Si3N4 membrane with Ti/Al patterns. The complete set of data shows that the CdTe quantum dot features the heavy-hole state as a ground state, although the compressive mismatch strain promotes a light-hole ground state as soon as the aspect ratio is larger than unity (elongated dot). A numerical calculation of the whole structure shows that the transition from the heavy-hole to the light-hole configuration is pushed toward values of the aspect ratio much larger than unity by the presence of a (Zn, Mg)Te shell, and that the effect is further enhanced by a small valence band offset between the semiconductors in the dot and around it.
ISSN:0957-4484
1361-6528
DOI:10.1088/1361-6528/aaff17